Solenoid Archives - Page 2 of 3 - Transmission Digest
RAV4’s Transmission Dilemma Presents Challenge

The code chart for the P0770 shift-solenoid-E malfunction has a simple description of the diagnostic trouble code (DTC) checking condition: It says that the lockup does not occur during lockup range (50 mph) or lockup remains on during lockup-off range. The possible causes listed are that the shift-solenoid valve is stuck open or closed, the valve body is blocked or stuck, or the clutch is locked up.

Clearing up Some Toyota Solenoid Confusion

Different terminology for the same part has been an ongoing problem in the transmission industry ever since I can remember. When I was learning to rebuild transmissions, Chrysler Torqueflite and Ford C-4 transmissions were always in the shop. These two transmissions had the same power flow, but all the internal components had different names.

Low/Reverse-Solenoid Circuit Fault Code P0750 (41)

Without question, aside from P1776 (47), one of the most-common trouble codes plaguing Dodge/Chrysler vehicles is P0750 (or 41), “Low/Reverse Solenoid Circuit error,” in 41TE-type transmissions (see Shift Pointers, October 2008). This is purely an electrical code and typically points to the solenoid, the wiring (which includes the connectors) from the solenoid body to the TCM, or the TCM itself. In so many instances on our technical hotline the cause has been a defective TCM. What becomes very frustrating is out-of-the-box remanufactured TCMs coughing up the same code as soon as they are installed; makes you think you missed something in your previous diagnosis.

Solenoid-Pack Information for the Chrysler 62TE

The 62TE solenoid pack is made up of six shift solenoids, one line-pressure solenoid, a temperature sensor and five pressure switches. The pressure switches are just like the ones in a 604 solenoid pack.

Volkswagen DSG 02E: A simple fix for a solenoid problem

With the increase in manufacturers forcing the purchase of subcomponent replacements rather than enabling you to buy only what you need, it’s great to get a break every once in a while. Such is the case with Volkswagen’s 02E Direct Shift Gearbox. The solenoids mounted on the valve body are not available individually, so if you needed just one solenoid you would have to buy the entire Mechatronic assembly (valve body, solenoids and TCM) for about a thousand bucks.

Similar but Different: A look at Ford’s 6R140W

For the 2011 model year Ford Motor Co. replaced the 5R110W in its Super Duty pickup trucks with a full-time six-speed transmission. Those of us in the aftermarket industry are calling this transmission the 6R140W. Ford likes to call it the TorqShift®6.

Aisin AW Linear Solenoids

In this article, the AW 55-50/51 five-speed (also known as AF 23/33) will be referred to as the AW 5.

Solenoid Mix-ups

The SLT and SL1, 2 and 3 solenoids used in the U150/250 transmission (Figure 1) can easily be positioned incorrectly, causing a variety of malfunctions such as wrong-gear starts, no shifts and bind-ups, to name a few.

GM’s 2MT70

Getting into the valve body is all we need to do to finalize our brief look at GM’s front-wheel-drive two-mode hybrid transmission.

If you recall from the first article, the TCM and solenoid-body assembly is first removed from the transmission followed by the plate attaching the assembly to the valve body (figures 1, 2 and 3).

What the …!

In essence, this equates to a hydraulic or mechanical problem in the intermediate-clutch circuit, which could mean that once second gear is commanded, the TCM does not see the correct second-gear ratio.

Clever Engineering

Starting with the 42RLE in 2005, followed by the 41TE in 2007, the engineers cleverly redesigned the valve body to accommodate a variable line-pressure-control solenoid and transducer. Figures 1 and 2 shows how these additional components are situated on the valve body with the 41TE transmission. This also required an additional pass-through case connector, resulting in changes to the case as well.

DTC Dilemma

The code displayed was 00349, with the definition of an electrical fault for solenoid 10. The first thing I thought was, “How can you have a code for solenoid 10 when there are only nine solenoids in the unit, and which of those solenoids would number 10 be?”